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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 161 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 161 Page - ATMEL Corporation |
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161 / 386 page  161 2467S–AVR–07/09 ATmega128 Output Compare Modulator (OCM1C2) Overview The Output Compare Modulator (OCM) allows generation of waveforms modulated with a carrier frequency. The modulator uses the outputs from the Output Compare Unit C of the 16-bit Timer/Counter1 and the Output Compare Unit of the 8-bit Timer/Counter2. For more details about these Timer/Counters see “16-bit Timer/Counter (Timer/Counter1 and Timer/Counter3)” on page 112 and “8-bit Timer/Counter2 with PWM” on page 146. Note that this feature is not available in ATmega103 compatibility mode. Figure 72. Output Compare Modulator, Block Diagram When the modulator is enabled, the two output compare channels are modulated together as shown in the block diagram (Figure 72). Description The Output Compare unit 1C and Output Compare unit 2 shares the PB7 port pin for output. The outputs of the Output Compare units (OC1C and OC2) overrides the normal PORTB7 Register when one of them is enabled (i.e., when COMnx1:0 is not equal to zero). When both OC1C and OC2 are enabled at the same time, the modulator is automatically enabled. The functional equivalent schematic of the modulator is shown on Figure 73. The schematic includes part of the Timer/Counter units and the port B pin 7 output driver circuit. Figure 73. Output Compare Modulator, Schematic OC1C Pin OC1C / OC2 / PB7 Timer/Counter 1 Timer/Counter 2 OC2 PORTB7 DDRB7 DQ DQ Pin COM21 COM20 DATABUS OC1C / OC2 / PB7 COM1C1 COM1C0 Modulator 1 0 OC1C DQ OC2 DQ ( From Waveform Generator ) ( From Waveform Generator ) 0 1 Vcc |
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